Jellyfishes rely on drifting to eat. They take their luck with currents, and create tiny eddies to guide food toward their tendrils. Yet in waters from the Sea of Japan to the Black Sea, jellies today are thriving as many of their marine vertebrate and invertebrate competitors are eliminated by overfishing, dead zones and other human impacts. How have these drifters of the sea reversed millions of years of fish dominance, seemingly overnight?
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